I think you missed the point. The key was the first sentence he said, something about how everyone with a sign is right so he thought he'd make one too. Both the guy with the sign and the interviewer were playing along with the same joke. They were both being sarcastic.

overall i found it funny XD
but overall it was also pointless. sorry but i had to report it

Sorry but I have to disagree with you.....how many threads in this forum are POINTLESS? (most of them?)